|United States Patent||6,329,603|
|Japp , et al.||December 11, 2001|
Conductive materials that have low coefficients of thermal expansion (CTEs) and that are used for power and ground planes are disclosed. Fibrous materials (such as carbon, graphite, glass, quartz, polyethylene, and liquid crystal polymer fibers) with low CTEs are metallized to provide a resultant conductive material with a low CTE. Such fibers may be metallized in their individual state and then formed into a fabric, or these materials may be formed into a fabric and then metallized or a combination of both metallizations may be used. In addition, a graphite or carbon sheet may be metallized on one or both sides to provide a material that has a low CTE and high conductivity. These metallized, low CTE power and ground planes may be laminated with other planes/cores into a composite, or laminated into a core which is then laminated with other planes/cores into a composite. The resultant composite may be used for printed circuit boards (PCBs) or PCBs used as laminate chip carriers.
|Inventors:||Japp; Robert M. (Vestal, NY), Poliks; Mark D. (Vestal, NY)|
International Business Machines Corporation
|Filed:||April 7, 1999|
|Current U.S. Class:||174/255 ; 174/256; 174/258; 174/262; 174/265; 174/266; 361/792; 361/794; 361/795; 428/901|
|Current International Class:||H05K 3/46 (20060101); H05K 1/03 (20060101); H05K 001/03 ()|
|Field of Search:||174/255,261,262,263,264,265,266,256,257,258,259 361/792,793,794,795 428/901|
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